Doppler spectrum gravity center correction-based frequency modulation continuous wave landing radar speed measurement method

Abstract

The invention discloses a Doppler spectrum gravity center correction-based frequency modulation continuous wave landing radar speed measurement method. The implementation process of the method includes the following steps that: (1) the echo signals of a frequency modulation continuous wave landing radar are obtained; (2) the two-dimensional matrix of de-chirped echo signals is obtained; (3) the spectrum of difference frequency signals is obtained; (4) the first estimated values of the spectrum gravity center and spectrum width of the difference frequency signals are obtained; (5) the noise power of the spectrum of the difference frequency signals is calculated; (6) the second estimated values of the spectrum gravity center and spectrum width of the difference frequency signals are obtained; (7) the ground incident angle of the frequency modulation continuous wave landing radar is obtained; (8) a corrected Doppler spectrum gravity center is obtained; and (9) a corrected speed measurement result is obtained. According to the method of the invention, a gravity center correction coefficient is additionally adopted, so that a corrected speed estimation value is obtained. The method canbe used for frequency modulation continuous wave landing radar speed measurement and meet speed measurement requirements for higher precision.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and further relates to a frequency-modulated continuous wave FMCW (Frequency Modulated Continuous Wave) landing radar velocity measurement method based on Doppler spectral center of gravity correction in the technical field of radar data processing. In the present invention, after estimating the center of gravity of the echo Doppler spectrum of the frequency modulation continuous wave landing radar using the formula of the center of gravity method, the center of gravity of the frequency modulation continuous wave landing radar relative to the ground is measured by using the corrected center of gravity of the echo Doppler spectrum. Background technique [0002] The basic principle of radar speed measurement is the application of Doppler effect. The Doppler effect means that when there is relative radial motion between the transmitting source and the receiver, the frequency of the re...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to be filtered by an adaptive Kalman filter, and in the application scenario of frequency-modulated continuous wave landing radar, the amount of calculation is relatively large

However, the disadvantage of this method is that the correction accuracy of the Doppler frequency is related to the selection of the window function type and the number of sampling points

When the window function selects a rectangular window or selects a small number of sampling points, the correction accuracy of the Doppler frequency is low, which cannot meet the high speed measurement accuracy requirements of the frequency modulation continuous wave landing radar

Images